Broadcom Corporation

Avago Technologies General IP (singapore) Pte. Ltd.

Fu-Hsuan Chiu

Guosen Yue

Chun-Hsuan Kuo

Hou-Shin Chen

Bin Liu

Wei Luo

Kai Li

Embodiments provide systems and methods for selecting almost-blank sub-frames (ABSs) in wireless networks. ABSs may be utilized as part of enhanced inter-cell interference cancellation (eICIC). In an embodiment, an ABS pattern is selected in a distributed fashion without use of a direct interface between neighboring base stations. Embodiments operate with a hybrid self-organizing network (SON) that includes a centralized self-organizing network (cSON) unit and a distributed self-organizing network (dSON) unit. The cSON may provide the dSON with information about a plurality of ABS patterns, and the dSON may utilize the information received from the cSON to select an ABS pattern from the plurality of ABS patterns. In some embodiments, a base station may select neighboring base stations to perform eICIC based on a reference signal received power (RSRP).

Methods and systems for almost blank subframe (ABS) pattern selection for small cells

In some aspects, the disclosure is directed to methods and systems for intelligent transmit power management. Output power levels may be dynamically determined responsive to REM measurements, user equipment (UE) signal reports, information received from other cells (e.g. via X2 application protocol (X2AP) or other such communication protocols), or any combination of these or other information in an iterative level conditioning and limit checking process.

Transmit power management design and implementation

Methods relating to managing operations of small cells are provided. One method includes receiving, from a management system configured to manage one or more operations of a plurality of small cells, a plurality of fractional frequency reuse (FFR) patterns for a frequency range. Each FFR pattern is configured to define a plurality of cell groupings, each including one or more of the plurality small cells. Each of the plurality of cell groupings is configured to transmit downlink transmissions over a different one of a plurality of frequency bands within the frequency range. The method further includes selecting a first FFR pattern from among the plurality of FFR patterns received from the management system and transmitting downlink transmissions in accordance with the first FFR pattern.

Frequency coordination for downlink transmissions

Code detection to assist a symbol-level equalizer in a receiver is described. In an embodiment, code detection uses adaptive Infinite Impulse Response (IIR) filtering to determine spreading code usage information and active code channels in a received signal. The spreading code usage information indicates if a spreading code associated with a code channel is among spreading codes used in the received signal. In another embodiment, the spreading code usage information is determined based on a forgetting factor associated with the filtering of a symbol power associated with the code channel.

Adaptive infinite impulse response (IIR)-based code detection for symbol-level equalizer

Techniques are described herein that receive communications transmitted according to different operation modes at a multi-mode, programmable receiver system. The multi-mode, programmable receiver system may receive communication signals from transmit antennas in 'cells' (e.g., base station transceivers and/or the like) according to one or more operation modes, using receive antennas. The received signals may be converted and processed by various modules of the multi-mode, programmable receiver system to produce an output signal. The multi-mode, programmable receiver system includes modules that are programmable to be selectively enabled or disabled according to an operation mode in accordance with which the multi-mode, programmable receiver system operates.

Unified, programmable receiver with support for multiple modes

A communication device, such as a smart phone, includes logic to determine a noise power estimate. In an example, a frequency domain calculation may be used to determine noise components within the noise power estimate. Further, a product of a channel estimate and equalizer effect may be used in the determination of the levels noise components, such as, inter-symbol interference power and neighbor cell interference power.

Unified interference power estimation

In one embodiment, interference suppression is improved by improving convergence criteria. For some embodiments, convergence is improved by employing non-constant alpha-beta-weighting. For other embodiments, convergence is improved by employing successive interference suppression methods that have guaranteed convergence properties.

Convergence during interference suppression

A frequency domain chip-level equalizer is disclosed. The equalizer includes an estimation module configured to generate a frequency domain estimate of an auto-correlation function of a received signal; and an equalization module configured to apply frequency domain equalization to the received signal using the frequency domain estimate of the auto-correlation function to generate frequency domain equalized samples of the received signal. The equalizer further includes an Inverse Fast Fourier Transform (IFFT) module configured to generate time domain equalized samples of the received signal from the frequency domain equalized samples.

Blind frequency domain interference aware chip-level equalization

Various embodiments are directed towards suppressing inter-cell and intra-cell interference. In some embodiments, an intra-cell interference signal for a specified rake finger is received. An inter-cell interference signal is received. The intra-cell interference signals upstream of a chip-level equalizer are suppressed. The inter-cell interference signals upstream of the chip-level equalizer are suppressed.

Growing community of inventors

Berkeley Heights, NJ, United States of America

Fu-Hsuan Chiu